<!--除登录页以外所有页面的父级页面，编写共有的左侧菜单栏与头部-->
<template>
  <!-- 1. display: flex;给父容器使用弹性布局可以使所有子元素横置靠左排列-->
  <div style="display: flex;">
    <!--2. isCollapse为true:折叠左侧菜单栏,左侧菜单栏宽度为64px,右侧主体宽度为calc(100% - 64px)-->
    <!--3. isCollapse为false:不折叠左侧菜单栏，左侧菜单栏宽度为208px,右侧主体宽度为calc(100% - 208px)-->
    <div :style="{width:(isCollapse ? '64px' : '208px')}">
      <!--      左侧菜单栏-->
      <!-- unique-opened只允许同时打开- -项菜单项router允许菜单项进行路由跳转-->
      <!-- :collapse- transition= "false" 去掉折叠的过渡,否则会感觉卡一下-->
      <el-menu
          background-color="#3c82f5"
          text-color="#fff"
          active-text-color="#ff0"
          :collapse="isCollapse"
          style="width: 100%;height: 100vh;"
          unique-opened
          router
          :collapse-transition="false"
          @select="selectMenu"
      >
      <!--        左侧菜单栏的顶部条-->
      <el-row style="padding-top: 10px;">
        <el-col :span="2"></el-col>
        <el-col :span="7" style="padding-left: 7px;">
          <el-avatar src="/imgs/admin/logo.png" style="width: 35px;height: 35px;"></el-avatar>
        </el-col>
        <el-col :span="isCollapse ? 0 : 13">
          <router-link to="/" style="=color:#fff;font-weight: bold;text-decoration: none;
          position:relative;top:8px;left:2px">智慧车辆
          </router-link>
        </el-col>
      </el-row>
      <el-sub-menu index="1">
        <template #title>
          <el-icon style="font-size: 21px;">
            <User/>
          </el-icon>
          <span>用户管理</span>
        </template>
        <el-menu-item index="/user">用户列表</el-menu-item>
      </el-sub-menu>
      <el-sub-menu index="2">
        <template #title>
          <el-icon style="font-size: 21px;">
            <Van/>
          </el-icon>
          <span>车辆管理</span>
        </template>
        <el-menu-item index="/vehicle">基本信息</el-menu-item>
      </el-sub-menu>
      <el-sub-menu index="3">
        <template #title>
          <el-icon style="font-size: 21px;">
            <Location/>
          </el-icon>
          <span>电子围栏</span>
        </template>
        <el-menu-item index="/geofence">围栏管理</el-menu-item>
      </el-sub-menu>
      <el-sub-menu index="4">
        <template #title>
          <el-icon style="font-size: 21px;">
            <Place/>
          </el-icon>
          <span>调度管理</span>
        </template>
        <el-menu-item index="/application">申请列表</el-menu-item>
        <el-menu-item index="/audit">调度审核</el-menu-item>
        <el-menu-item index="/distribute">车辆分配</el-menu-item>
      </el-sub-menu>
      <el-sub-menu index="5">
        <template #title>
          <el-icon style="font-size: 21px;">
            <MessageBox/>
          </el-icon>
          <span>数据字典</span>
        </template>
        <el-menu-item index="/dict">字典管理</el-menu-item>
      </el-sub-menu>
      </el-menu>
    </div>
    <div :style="{width:(isCollapse ? 'calc(100% - 64px)' : 'calc(100% - 208px)')}">
      <!--      顶部菜单栏-->
      <el-header style="height:10vh;background-color:#fff;padding-top:22px;">
        <el-row :gutter="10">
          <el-col :span="18">
            <el-icon style="font-size: 20px" @click="changeCollapse">
              <Expand/>
            </el-icon>
          </el-col>
          <el-col :span="6" style="position:relative">
            <el-dropdown trigger="click" style="position: absolute;right: 20px">
            <span style="font-size: 19px;font-weight: bold;">
              {{ user.username }}
              <el-icon><arrow-down/></el-icon>
            </span>
              <template #dropdown>
                <el-dropdown-menu>
                  <el-dropdown-item @click="logout">退出登录</el-dropdown-item>
                </el-dropdown-menu>
              </template>
            </el-dropdown>
          </el-col>
        </el-row>
        <!--        面包屑导航-->
        <el-breadcrumb separator="/" style="position: relative;top: 20px">
          <el-breadcrumb-item>首页</el-breadcrumb-item>
          <el-breadcrumb-item v-for="item in breadcrumb">{{item}}</el-breadcrumb-item>
        </el-breadcrumb>
      </el-header>
      <!--      右侧主体内容:除了顶部条与面包屑之外的可变区域,其他具体内容在子页面中写!-->
      <el-main style="height: 90vh;padding: 0;overflow-y:auto;">
      <router-view/>
      </el-main>
    </div>
  </div>

</template>

<script setup>
import {ref} from "vue";

//定义变量控制菜单是否折叠
const isCollapse = ref(false);
const changeCollapse = () => {
  isCollapse.value = !isCollapse.value;
}

//获取当前登录的用户对象
const user = ref(getUser());
//定义退出登录功能
const logout = () => {
  if (confirm('确定退出登录吗？')) {
    //清空本地存储的用户信息 + 面包屑数据
    localStorage.removeItem('user');
    localStorage.removeItem('breadCrumb');
    //跳转到登录页
    // router.push('/login');
    window.location.href = '/login';
    //也要把已经取出来的user对象清空
    user.value = '';
  }
}
//定义当前面包屑数组的显示值
const breadcrumb = ref(
    JSON.parse(localStorage.getItem('breadCrumb'))||['用户管理', '用户列表']);
//定义集合来维护页面路径与面包屑的对应关系
let map = {
  "/user":['用户管理','用户列表'],
  "/vehicle":['车辆管理','基本信息'],
  "/geofence":['电子围栏','围栏管理'],
  "/application":['调度管理','申请列表'],
  "/audit":['调度管理','调度审核'],
  "/distribute":['调度管理','车辆分配'],
  "/dict":['数据字典','字典管理']
};
//只要选择了菜单项,就切换对应的面包屑
const selectMenu = (index) => {
  breadcrumb.value = map[index];
  //解决面包屑丢失问题:每次切换页面时,将当前页对应的面包屑值存入localStorage中
  localStorage.setItem('breadCrumb', JSON.stringify(breadcrumb.value));
}

</script>



















